Thin Cation‐Exchanger Films by Plasma Polymerization of 1,3‐Butadiene and Methyl Benzenesulfonate

Abstract

Ultrathin, uniform, pinhole-free films containing sulfonic ester groups were prepared by plasma-polymerization of 1,3-butadiene and methyl benzenesulfonate. The sulfonic ester groups of the resulting plasma polymer were transformed to lithium sulfonate by reaction with lithium iodide. The sulfonate cation-exchange films thus prepared had excellent permselectivity, as shown by the K + ion transference number of 0.99 in aqueous KC1, and a low resistance per unit area, of 0.04 D-cm 2, in 0.5M aqueous H2SO4 (ionic conductivity = 1.8 x 10 -4 S cm-1).

Optimization and synthesis of plasma polymerized proton exchange membranes for direct methanol fuel cells

“…Therefore, the synthesized plasma polymerized membranes usually exhibit lower intrinsic proton conductivity than Nafion [27][28][29][30][31]. To address this problem, the technique must be improved.…”

Ion‐Exchange Plasma Membranes for Fuel Cells on a Micrometer Scale

“…In the literature, the first papers devoted to the development of plasma-polymerized membranes for fuel cells were published at the end of the 1980 s, beginning of the 1990 s, by Japanese groups. [1][2][3][4][5][6] Today, research groups working on that subject remain very few, and their published results are, as yet, not as good as those obtained with conventional membranes. [7][8][9][10][11][12][13][14][15][16] Previous studies by our group, published in journals in the field of membranes or fuel cells, have focused on the description of the plasma polymerization technique (principle and apparatus) and presentation of many detailed results relative to the fragmentation of monomers in plasma reactors (using mass spectrometry analysis), the microstructural (morphology, density, chemical structure) and transport properties (ionic conductivity, ion transport number, fuel sorption, and permeability) of plasma-polymerized membranes; some correlations between the plasma synthesis parameters and the material properties have been established.…”

Electrochemical properties of PP membranes with plasma polymer coatings of acrylic acid

“…2A, the electrical resistance dramatically decreased from 590 to around 100 cm 2 at 10 min, and then increased slightly as the plasma polymerization time increased further. The initial decrease in the electrical resistance of plasma polymerization coating is likely due to the acidic moieties introduced by the plasma polymerization coating of acrylic acid, while the subsequent increase in the electrical resistance after the sharp drop can be explained by the increased ohmic resistance [22]. In contrast, the transport number (TN) increased from 0.5 (as-received) to 0.81 (40 min) and then leveled off (Fig.…”

“…Recently, dry modification processes that generate no waste have been introduced, such as polymer grafting via UV [14], radiation [15], ozone [16] and plasma [17][18], and plasma polymerization coating [19][20][21][22][23][24][25][26][27][28]. Among these, plasma polymerization coating has received great attention as it can provide pinhole-free, ultra-thin films with various functional groups and is also an environmentally clean process [29].…”

“…Consequently, monomers containing such moieties have been utilized for plasma polymerization coating [20][21][22][23]. However, only few such monomers are available and thus, other monomers containing polar moieties such as amines [24] or styrene [17] are also utilized.…”